2 Voip Practical Guide, VOIP 1

[ Pobierz całość w formacie PDF ]
Network Test Solutions
Voice Over IP:
Guaranteeing Carrier
Grade Performance
©RADCOM Ltd., July 2002
Revision B
T
able
o
f
Cont
e
nt
s
Introduction
1
VoIP Architecture
3
Test Strategy
4
VoIP Testing
6
Gateway Testing
13
Gatekeeper Testing
16
IVR Testing
19
Billing & Pre-paid Testing
21
NMS Testing
22
Conclusion
22
Appendix 1: List of Specifications
24
Appendix 2: Glossary
25
About RADCOM
28
 G
u
a
r
a
n
t
e
e
ing C
a
rr
i
e
r
Gr
a
d
e
Pe
r
form
a
n
c
e
Introduction
Voice over IP networks are complex. They represent the converging worlds of
tele- and data communications, and therefore present myriad implementation
and testing challenges:
• Integration to traditional telecom infrastructure
• Integration to billing systems
• Many add-on services
• Large variety of protocols
• Quality is an issue
• Network specialists are expensive and scarce
• Reliability is a must
• Multiple High Quality Services: voice, fax, video, unified messaging, call
centers, etc.
This white paper presents a typical VoIP architecture and then suggests a
framework for testing VoIP networks. The test strategy is presented as well as
a detailed discussion of the actual testing required for each network element.
Finally, a list of Voice over IP specifications is provided as an appendix as well
as a list of acronyms. The main objective of this paper is to provide insight into
the intricacies of architecting Voice over IP networks of carrier grade quality.
It is intended for network design and test engineers.
 2
Currently, there is only one system in the market that allows full end to end
testing and mapping of quality vs. stress. This is RADCOM's VoIP
Performer™.
It introduces a new conceptual method for testing Voice over IP networks, as
can be seen in Figure 1. The Performer™ includes high performance
emulation and simulation components as well as powerful quality
measurement and analysis components. The complete system is controlled
from a single management console and allows scripting and automating of the
testing procedures.
The following are the components of the Performer™:
• QPro - multiple PSTN client emulation including objective quality
measurements.
• 323Sim - multiple H.323 client emulation including registration, signaling
and media.
• SIPSim - multiple SIP client emulation including registration, signaling and
media.
• NetSim - network cloud emulation including introduction of impairments.
Gu
a
ran
t
eei
n
g C
a
rr
i
e
r
Gr
a
de Per
f
or
m
ance
3
• MediaPro - real time packet based objective and subjective quality
measurements.
Figure 1:
RADCOM's VoIP Performer™ introduces a new conceptual method for testing Voice
over IP networks
VoIP Architecture
A typical VoIP network includes the following components:
• Media gateways
• Signaling gateways
• Gatekeepers
•Class5switches
• SS7 network
• Network management system
• Billing systems
Gua
r
ant
e
eing Ca
r
r
i
er
Grad
e
Per
fo
r
m
ance
[ Pobierz całość w formacie PDF ]
  • zanotowane.pl
  • doc.pisz.pl
  • pdf.pisz.pl
  • charloteee.keep.pl